Bundletool does not recognize `android:installLocation="0"`

[benjaminRomano]

Background

We are exploring uncompressed native libraries for our application and observed an issue where Bundletool is not respecting the installLocation flag for disabling uncompressed native libraries for Android 6 to 9 where the app may be installed on external storage (and consequently lead to a security exception).

Within our AndroidManifest.xml, we've got the following, android:installLocation="0", which is equivalent to android:installLocation="auto". In our source code we are using android:installLocation="auto" so some intermediate step in our build system, which leverages Bazel's rules_android, is performing this translation before we generate the App Bundle.

Issue

Bundletool assumes that android:installLocation is a string value and fails to process android:installLocation="0".

name: "installLocation"
source {
}
resource_id: 16843447
compiled_item {
  prim {
    int_decimal_value: 0
  }
}

// Returns 0
appBundle.getBaseModule().getAndroidManifest().getManifestElement().getAndroidAttribute(AndroidManifest.INSTALL_LOCATION_RESOURCE_ID).get().getValueAsInteger()

// Returns ""
appBundle.getBaseModule().getAndroidManifest().getManifestElement().getAndroidAttribute(AndroidManifest.INSTALL_LOCATION_RESOURCE_ID).get().getValueAsString()

This occurs here: https://github.com/google/bundletool/blob/master/src/main/java/com/android/tools/build/bundletool/model/AndroidManifest.java#L739

  /** Returns the string value of the 'installLocation' attribute if set. */
  public Optional<String> getInstallLocationValue() {
    return getManifestElement()
        .getAndroidAttribute(INSTALL_LOCATION_RESOURCE_ID)
        .map(XmlProtoAttribute::getValueAsString);
  }

It's possible that there are other places within AndroidManifest.xml that cannot properly account for integers instead of strings.

If it would help, I can share our App Bundle or email to test other potential breakages in Android Manifest introspection.